/*
 * Copyright (C) 2012 Stormpath, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.stormpath.samples.todos.service;

import com.stormpath.samples.todos.entity.Todo;
import com.stormpath.samples.todos.entity.User;

import java.util.Collection;
import java.util.Date;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;

public class DefaultTodoService implements TodoService {

	// ordinarily this would be a DAO used to interact with a data store (e.g.
	// database or NoSQL store).
	Map<String, Todo> todos = new ConcurrentHashMap<String, Todo>();

	// ordinarily DependencyInjection would be used. This simple example just
	// uses a static singleton:
	private static final DefaultTodoService INSTANCE = new DefaultTodoService();

	// simulate a single User for the demo:
	private final User user;

	public DefaultTodoService() {
		// simulate a single User for this demo:
		User user = new User();
		user.setId(UUID.randomUUID().toString().replace("-", ""));
		user.setUsername("jsmith");
		user.setGivenName("John");
		user.setSurname("Smith");
		this.user = user;
	}

	public Collection<Todo> getTodos() {
		return todos.values();
	}

	public Todo getById(String id) {
		return todos.get(id);
	}

	public Todo save(Todo todo) {
		String id = todo.getId();
		if (id == null) {
			// create:
			id = UUID.randomUUID().toString().replace("-", "");
			todo.setId(id);

			// set creation date:
			todo.setCreated(new Date());
			todos.put(id, todo);

			todo.setUser(getCurrentUser());
		} else {
			// update:
			todos.put(id, todo);
		}

		return todo;
	}

	protected User getCurrentUser() {
		// return the 'current user' based on a security framework like Shiro.
		// For this demo, we'll just assume a simulated/manually-constructed
		// one:
		return this.user;
	}

	public Todo deleteById(String id) {
		return todos.remove(id);
	}

	public static TodoService getInstance() {
		return INSTANCE;
	}
}
